The group found its signature sound almost by accident. When the group was rehearsing in a studio, which was situated opposite a cinema showing a horror movie, Osbourne recalls that Bill Ward remarked to the rest of the band how it was strange that people willingly paid to see a movie intended to scare them. The band began to purposely write dark, ominous songs in an attempt to be music's answer to horror films, and in rebellion against the prevalent happy pop music of the 1960s. In a VH1 documentary about the band, Ozzy Osbourne recalled the laughable lyrics of radio-friendly pop at the time, such as "if you ever go to San Francisco, be sure to wear a flower in your hair...," "screw that,", they said, "let's go over there and scare everyone!"

Calicougar said: wasent the band going to be called "earth" when they first got togeather?

Yeah.They originally called their jazz-blues band Polka Tulk, later renaming themselves Earth, and they played extensively in Europe. In early 1969, they decided to change their name again when they found that they were being mistaken for another group called Earth. Butler had written a song that took its title from a novel by occult writer Dennis Wheatley, Black Sabbath, and the group adopted it as their name as well.